Bat is an acronym for the term Bitch Ass Trick. Just listen to how the words roll of your tongue. Bitch Ass Trick. Bat is a shorter term to use when the user feels like denying themselves of such revelry when saying the term Bitch Ass Trick.

a small pipe that only holds a tiny amount of marijuana, only enough for one hit, it's shaped like a ciggerette and is about as long as a ciggerette as well. most bats come with a dug-out as a set, and are usually stored inside the dug-out for convenience

You wanna take a rip off the bat?
All I have is a bat, and dug-out.
Lets smoke the kief with the bat.

1)A bat is not a rat with wings or a rodent , they are mamals of the order Chiroptera, and are highly intelligent. They are the only mammal that can fly. There are only two types of 'vampire bats' that acually suck blood and they live in South America(mostly).
2)a club used for hitting a ball in various games
3)strike with, or as if with a baseball bat